[Tether07] Migrate Tethering into module

Now tethering would be run in dedicated service.
TetheringManager is the interface used to communicate with
TetheringService. The new call flow would be: ConnectivityManager
-> ConnectivityService -> TetheringManager -> TetheringService.
Note: the return value of #tether(), #untether() and #setUsbTethering()
APIs would always be no error. Client can use #getLastTetherError()
or #getTetheredIfaces or listen tether state change to check
status of corresponding interface.

Bug: 136040414
Bug: 144742179
Test: -build, flash, boot
      -atest TetheringTests
      -atest FrameworksNetTests

Change-Id: I7e78c0e0a3e70f940a749ba2a39ece7c7ec5b9b3
Merged-In: I7e78c0e0a3e70f940a749ba2a39ece7c7ec5b9b3
diff --git a/Tethering/AndroidManifest.xml b/Tethering/AndroidManifest.xml
index eb51593..1430ed0 100644
--- a/Tethering/AndroidManifest.xml
+++ b/Tethering/AndroidManifest.xml
@@ -25,5 +25,11 @@
         android:process="com.android.networkstack.process"
         android:extractNativeLibs="false"
         android:persistent="true">
+        <service android:name="com.android.server.connectivity.tethering.TetheringService"
+                 android:permission="android.permission.MAINLINE_NETWORK_STACK">
+            <intent-filter>
+                <action android:name="android.net.ITetheringConnector"/>
+            </intent-filter>
+        </service>
     </application>
 </manifest>